Yes except often we WANT to force a restart when the power button no longer works. I've got a Dell PowerEdge 800 here that from time to time will not reboot via holding the power button down. That means unplugging it.

Battery backups are a LOT cheaper for now that exotic stateful memory solutions. You can have your speed and keep it too. Battery backups aren't very expensive.

Even a crummy laptop can standby for several days (my crummy 2002 Toshiba $1000 unit lasts 5 days)